7L13 Phase Lock Fault


Hello everyone
I'm haunted by phase lock failures. When I select span / div at 50 kHz or lower the signal on the screen does not stand still and hops from left to right. I also noticed that the noise (Klank) of switching from 100 kHz span / div to 50 kHz span / div is no longer heard, but only a relay (click).
The rest seem to work fine.
The 7L13 is very compact, if you have targeted advice on where to investigate / act I would be grateful.

-- Cheers

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